src/glx/glxextensions.c

   1 /*
   2  * (C) Copyright IBM Corporation 2002, 2004
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file glxextensions.c
  27  *
  28  * \author Ian Romanick <idr@us.ibm.com>
  29  */
  30
  31 #include "glxclient.h"
  32 #include <X11/extensions/extutil.h>
  33 #include <X11/extensions/Xext.h>
  34 #include <string.h>
  35 #include "glxextensions.h"
  36
  37
  38 #define SET_BIT(m,b)   (m[ (b) / 8 ] |=  (1U << ((b) % 8)))
  39 #define CLR_BIT(m,b)   (m[ (b) / 8 ] &= ~(1U << ((b) % 8)))
  40 #define IS_SET(m,b)    ((m[ (b) / 8 ] & (1U << ((b) % 8))) != 0)
  41 #define CONCAT(a,b) a ## b
  42 #define GLX(n) "GLX_" # n, 4 + sizeof( # n ) - 1, CONCAT(n,_bit)
  43 #define GL(n)  "GL_" # n,  3 + sizeof( # n ) - 1, GL_ ## n ## _bit
  44 #define VER(a,b)  a, b
  45 #define Y  1
  46 #define N  0
  47 #define EXT_ENABLED(bit,supported) (IS_SET( supported, bit ))
  48
  49
  50 struct extension_info
  51 {
  52    const char *const name;
  53    unsigned name_len;
  54
  55    unsigned char bit;
  56
  57    /* This is the lowest version of GLX that "requires" this extension.
  58     * For example, GLX 1.3 requires SGIX_fbconfig, SGIX_pbuffer, and
  59     * SGI_make_current_read.  If the extension is not required by any known
  60     * version of GLX, use 0, 0.
  61     */
  62    unsigned char version_major;
  63    unsigned char version_minor;
  64    unsigned char client_support;
  65    unsigned char direct_support;
  66    unsigned char client_only;        /** Is the extension client-side only? */
  67    unsigned char direct_only;        /** Is the extension for direct
  68                                       * contexts only?
  69                                       */
  70 };
  71
  72 /* *INDENT-OFF* */
  73 static const struct extension_info known_glx_extensions[] = {
  74    { GLX(ARB_create_context),          VER(0,0), Y, N, N, N },
  75    { GLX(ARB_create_context_profile),  VER(0,0), Y, N, N, N },
  76    { GLX(ARB_get_proc_address),        VER(1,4), Y, N, Y, N },
  77    { GLX(ARB_multisample),             VER(1,4), Y, Y, N, N },
  78    { GLX(ATI_pixel_format_float),      VER(0,0), N, N, N, N },
  79    { GLX(EXT_import_context),          VER(0,0), Y, Y, N, N },
  80    { GLX(EXT_visual_info),             VER(0,0), Y, Y, N, N },
  81    { GLX(EXT_visual_rating),           VER(0,0), Y, Y, N, N },
  82    { GLX(EXT_framebuffer_sRGB),        VER(0,0), Y, Y, N, N },
  83    { GLX(EXT_create_context_es2_profile), VER(0,0), Y, N, N, Y },
  84    { GLX(MESA_copy_sub_buffer),        VER(0,0), Y, N, N, N },
  85    { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N },
  86    { GLX(MESA_swap_control),           VER(0,0), Y, N, N, Y },
  87    { GLX(NV_float_buffer),             VER(0,0), N, N, N, N },
  88    { GLX(OML_swap_method),             VER(0,0), Y, Y, N, N },
  89    { GLX(OML_sync_control),            VER(0,0), Y, N, N, Y },
  90    { GLX(SGI_make_current_read),       VER(1,3), Y, N, N, N },
  91    { GLX(SGI_swap_control),            VER(0,0), Y, N, N, N },
  92    { GLX(SGI_video_sync),              VER(0,0), Y, N, N, Y },
  93    { GLX(SGIS_multisample),            VER(0,0), Y, Y, N, N },
  94    { GLX(SGIX_fbconfig),               VER(1,3), Y, Y, N, N },
  95    { GLX(SGIX_pbuffer),                VER(1,3), Y, Y, N, N },
  96    { GLX(SGIX_swap_barrier),           VER(0,0), N, N, N, N },
  97    { GLX(SGIX_swap_group),             VER(0,0), N, N, N, N },
  98    { GLX(SGIX_visual_select_group),    VER(0,0), Y, Y, N, N },
  99    { GLX(EXT_texture_from_pixmap),     VER(0,0), Y, N, N, N },
 100    { GLX(INTEL_swap_event),            VER(0,0), Y, N, N, N },
 101    { NULL }
 102 };
 103
 104 static const struct extension_info known_gl_extensions[] = {
 105    { GL(ARB_depth_texture),              VER(1,4), Y, N, N, N },
 106    { GL(ARB_draw_buffers),               VER(0,0), Y, N, N, N },
 107    { GL(ARB_fragment_program),           VER(0,0), Y, N, N, N },
 108    { GL(ARB_fragment_program_shadow),    VER(0,0), Y, N, N, N },
 109    { GL(ARB_framebuffer_object),         VER(0,0), Y, N, N, N },
 110    { GL(ARB_imaging),                    VER(0,0), Y, N, N, N },
 111    { GL(ARB_multisample),                VER(1,3), Y, N, N, N },
 112    { GL(ARB_multitexture),               VER(1,3), Y, N, N, N },
 113    { GL(ARB_occlusion_query),            VER(1,5), Y, N, N, N },
 114    { GL(ARB_point_parameters),           VER(1,4), Y, N, N, N },
 115    { GL(ARB_point_sprite),               VER(0,0), Y, N, N, N },
 116    { GL(ARB_shadow),                     VER(1,4), Y, N, N, N },
 117    { GL(ARB_shadow_ambient),             VER(0,0), Y, N, N, N },
 118    { GL(ARB_texture_border_clamp),       VER(1,3), Y, N, N, N },
 119    { GL(ARB_texture_compression),        VER(1,3), Y, N, N, N },
 120    { GL(ARB_texture_cube_map),           VER(1,3), Y, N, N, N },
 121    { GL(ARB_texture_env_add),            VER(1,3), Y, N, N, N },
 122    { GL(ARB_texture_env_combine),        VER(1,3), Y, N, N, N },
 123    { GL(ARB_texture_env_crossbar),       VER(1,4), Y, N, N, N },
 124    { GL(ARB_texture_env_dot3),           VER(1,3), Y, N, N, N },
 125    { GL(ARB_texture_mirrored_repeat),    VER(1,4), Y, N, N, N },
 126    { GL(ARB_texture_non_power_of_two),   VER(1,5), Y, N, N, N },
 127    { GL(ARB_texture_rectangle),          VER(0,0), Y, N, N, N },
 128    { GL(ARB_texture_rg),                 VER(0,0), Y, N, N, N },
 129    { GL(ARB_transpose_matrix),           VER(1,3), Y, N, Y, N },
 130    { GL(ARB_vertex_buffer_object),       VER(1,5), N, N, N, N },
 131    { GL(ARB_vertex_program),             VER(0,0), Y, N, N, N },
 132    { GL(ARB_window_pos),                 VER(1,4), Y, N, N, N },
 133    { GL(EXT_abgr),                       VER(0,0), Y, N, N, N },
 134    { GL(EXT_bgra),                       VER(1,2), Y, N, N, N },
 135    { GL(EXT_blend_color),                VER(1,4), Y, N, N, N },
 136    { GL(EXT_blend_equation_separate),    VER(0,0), Y, N, N, N },
 137    { GL(EXT_blend_func_separate),        VER(1,4), Y, N, N, N },
 138    { GL(EXT_blend_logic_op),             VER(1,4), Y, N, N, N },
 139    { GL(EXT_blend_minmax),               VER(1,4), Y, N, N, N },
 140    { GL(EXT_blend_subtract),             VER(1,4), Y, N, N, N },
 141    { GL(EXT_clip_volume_hint),           VER(0,0), Y, N, N, N },
 142    { GL(EXT_compiled_vertex_array),      VER(0,0), N, N, N, N },
 143    { GL(EXT_convolution),                VER(0,0), N, N, N, N },
 144    { GL(EXT_copy_texture),               VER(1,1), Y, N, N, N },
 145    { GL(EXT_cull_vertex),                VER(0,0), N, N, N, N },
 146    { GL(EXT_depth_bounds_test),          VER(0,0), N, N, N, N },
 147    { GL(EXT_draw_range_elements),        VER(1,2), Y, N, Y, N },
 148    { GL(EXT_fog_coord),                  VER(1,4), Y, N, N, N },
 149    { GL(EXT_framebuffer_blit),           VER(0,0), Y, N, N, N },
 150    { GL(EXT_framebuffer_multisample),    VER(0,0), Y, N, N, N },
 151    { GL(EXT_framebuffer_object),         VER(0,0), Y, N, N, N },
 152    { GL(EXT_framebuffer_sRGB),           VER(0,0), Y, N, N, N },
 153    { GL(EXT_multi_draw_arrays),          VER(1,4), Y, N, Y, N },
 154    { GL(EXT_packed_depth_stencil),       VER(0,0), Y, N, N, N },
 155    { GL(EXT_packed_pixels),              VER(1,2), Y, N, N, N },
 156    { GL(EXT_paletted_texture),           VER(0,0), Y, N, N, N },
 157    { GL(EXT_pixel_buffer_object),        VER(0,0), N, N, N, N },
 158    { GL(EXT_point_parameters),           VER(1,4), Y, N, N, N },
 159    { GL(EXT_polygon_offset),             VER(1,1), Y, N, N, N },
 160    { GL(EXT_rescale_normal),             VER(1,2), Y, N, N, N },
 161    { GL(EXT_secondary_color),            VER(1,4), Y, N, N, N },
 162    { GL(EXT_separate_specular_color),    VER(1,2), Y, N, N, N },
 163    { GL(EXT_shadow_funcs),               VER(1,5), Y, N, N, N },
 164    { GL(EXT_shared_texture_palette),     VER(0,0), Y, N, N, N },
 165    { GL(EXT_stencil_two_side),           VER(0,0), Y, N, N, N },
 166    { GL(EXT_stencil_wrap),               VER(1,4), Y, N, N, N },
 167    { GL(EXT_subtexture),                 VER(1,1), Y, N, N, N },
 168    { GL(EXT_texture),                    VER(1,1), Y, N, N, N },
 169    { GL(EXT_texture3D),                  VER(1,2), Y, N, N, N },
 170    { GL(EXT_texture_compression_dxt1),   VER(0,0), Y, N, N, N },
 171    { GL(EXT_texture_compression_s3tc),   VER(0,0), Y, N, N, N },
 172    { GL(EXT_texture_edge_clamp),         VER(1,2), Y, N, N, N },
 173    { GL(EXT_texture_env_add),            VER(1,3), Y, N, N, N },
 174    { GL(EXT_texture_env_combine),        VER(1,3), Y, N, N, N },
 175    { GL(EXT_texture_env_dot3),           VER(0,0), Y, N, N, N },
 176    { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N },
 177    { GL(EXT_texture_lod),                VER(1,2), Y, N, N, N },
 178    { GL(EXT_texture_lod_bias),           VER(1,4), Y, N, N, N },
 179    { GL(EXT_texture_mirror_clamp),       VER(0,0), Y, N, N, N },
 180    { GL(EXT_texture_object),             VER(1,1), Y, N, N, N },
 181    { GL(EXT_texture_rectangle),          VER(0,0), Y, N, N, N },
 182    { GL(EXT_vertex_array),               VER(0,0), Y, N, N, N },
 183    { GL(3DFX_texture_compression_FXT1),  VER(0,0), Y, N, N, N },
 184    { GL(APPLE_packed_pixels),            VER(1,2), Y, N, N, N },
 185    { GL(APPLE_ycbcr_422),                VER(0,0), Y, N, N, N },
 186    { GL(ATI_draw_buffers),               VER(0,0), Y, N, N, N },
 187    { GL(ATI_text_fragment_shader),       VER(0,0), Y, N, N, N },
 188    { GL(ATI_texture_env_combine3),       VER(0,0), Y, N, N, N },
 189    { GL(ATI_texture_float),              VER(0,0), Y, N, N, N },
 190    { GL(ATI_texture_mirror_once),        VER(0,0), Y, N, N, N },
 191    { GL(ATIX_texture_env_combine3),      VER(0,0), Y, N, N, N },
 192    { GL(HP_convolution_border_modes),    VER(0,0), Y, N, N, N },
 193    { GL(HP_occlusion_test),              VER(0,0), Y, N, N, N },
 194    { GL(IBM_cull_vertex),                VER(0,0), Y, N, N, N },
 195    { GL(IBM_pixel_filter_hint),          VER(0,0), Y, N, N, N },
 196    { GL(IBM_rasterpos_clip),             VER(0,0), Y, N, N, N },
 197    { GL(IBM_texture_clamp_nodraw),       VER(0,0), Y, N, N, N },
 198    { GL(IBM_texture_mirrored_repeat),    VER(0,0), Y, N, N, N },
 199    { GL(INGR_blend_func_separate),       VER(0,0), Y, N, N, N },
 200    { GL(INGR_interlace_read),            VER(0,0), Y, N, N, N },
 201    { GL(MESA_pack_invert),               VER(0,0), Y, N, N, N },
 202    { GL(MESA_ycbcr_texture),             VER(0,0), Y, N, N, N },
 203    { GL(NV_blend_square),                VER(1,4), Y, N, N, N },
 204    { GL(NV_copy_depth_to_color),         VER(0,0), Y, N, N, N },
 205    { GL(NV_depth_clamp),                 VER(0,0), Y, N, N, N },
 206    { GL(NV_fog_distance),                VER(0,0), Y, N, N, N },
 207    { GL(NV_fragment_program),            VER(0,0), Y, N, N, N },
 208    { GL(NV_fragment_program_option),     VER(0,0), Y, N, N, N },
 209    { GL(NV_fragment_program2),           VER(0,0), Y, N, N, N },
 210    { GL(NV_light_max_exponent),          VER(0,0), Y, N, N, N },
 211    { GL(NV_multisample_filter_hint),     VER(0,0), Y, N, N, N },
 212    { GL(NV_packed_depth_stencil),        VER(0,0), Y, N, N, N },
 213    { GL(NV_point_sprite),                VER(0,0), Y, N, N, N },
 214    { GL(NV_texgen_reflection),           VER(0,0), Y, N, N, N },
 215    { GL(NV_texture_compression_vtc),     VER(0,0), Y, N, N, N },
 216    { GL(NV_texture_env_combine4),        VER(0,0), Y, N, N, N },
 217    { GL(NV_texture_rectangle),           VER(0,0), Y, N, N, N },
 218    { GL(NV_vertex_program),              VER(0,0), Y, N, N, N },
 219    { GL(NV_vertex_program1_1),           VER(0,0), Y, N, N, N },
 220    { GL(NV_vertex_program2),             VER(0,0), Y, N, N, N },
 221    { GL(NV_vertex_program2_option),      VER(0,0), Y, N, N, N },
 222    { GL(NV_vertex_program3),             VER(0,0), Y, N, N, N },
 223    { GL(OES_read_format),                VER(0,0), Y, N, N, N },
 224    { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N },
 225    { GL(SGI_color_matrix),               VER(0,0), Y, N, N, N },
 226    { GL(SGI_color_table),                VER(0,0), Y, N, N, N },
 227    { GL(SGI_texture_color_table),        VER(0,0), Y, N, N, N },
 228    { GL(SGIS_generate_mipmap),           VER(1,4), Y, N, N, N },
 229    { GL(SGIS_multisample),               VER(0,0), Y, N, N, N },
 230    { GL(SGIS_texture_border_clamp),      VER(1,3), Y, N, N, N },
 231    { GL(SGIS_texture_edge_clamp),        VER(1,2), Y, N, N, N },
 232    { GL(SGIS_texture_lod),               VER(1,2), Y, N, N, N },
 233    { GL(SGIX_blend_alpha_minmax),        VER(0,0), Y, N, N, N },
 234    { GL(SGIX_clipmap),                   VER(0,0), Y, N, N, N },
 235    { GL(SGIX_depth_texture),             VER(0,0), Y, N, N, N },
 236    { GL(SGIX_fog_offset),                VER(0,0), Y, N, N, N },
 237    { GL(SGIX_shadow),                    VER(0,0), Y, N, N, N },
 238    { GL(SGIX_shadow_ambient),            VER(0,0), Y, N, N, N },
 239    { GL(SGIX_texture_coordinate_clamp),  VER(0,0), Y, N, N, N },
 240    { GL(SGIX_texture_lod_bias),          VER(0,0), Y, N, N, N },
 241    { GL(SGIX_texture_range),             VER(0,0), Y, N, N, N },
 242    { GL(SGIX_texture_scale_bias),        VER(0,0), Y, N, N, N },
 243    { GL(SGIX_vertex_preclip),            VER(0,0), Y, N, N, N },
 244    { GL(SGIX_vertex_preclip_hint),       VER(0,0), Y, N, N, N },
 245    { GL(SGIX_ycrcb),                     VER(0,0), Y, N, N, N },
 246    { GL(SUN_convolution_border_modes),   VER(0,0), Y, N, N, N },
 247    { GL(SUN_multi_draw_arrays),          VER(0,0), Y, N, Y, N },
 248    { GL(SUN_slice_accum),                VER(0,0), Y, N, N, N },
 249    { NULL }
 250 };
 251 /* *INDENT-ON* */
 252
 253
 254 /* global bit-fields of available extensions and their characteristics */
 255 static unsigned char client_glx_support[8];
 256 static unsigned char client_glx_only[8];
 257 static unsigned char direct_glx_only[8];
 258 static unsigned char client_gl_support[__GL_EXT_BYTES];
 259 static unsigned char client_gl_only[__GL_EXT_BYTES];
 260
 261 /**
 262  * Bits representing the set of extensions that are enabled by default in all
 263  * direct rendering drivers.
 264  */
 265 static unsigned char direct_glx_support[8];
 266
 267 /**
 268  * Highest core GL version that can be supported for indirect rendering.
 269  */
 270 static const unsigned gl_major = 1;
 271 static const unsigned gl_minor = 4;
 272
 273 /* client extensions string */
 274 static const char *__glXGLXClientExtensions = NULL;
 275
 276 static void __glXExtensionsCtr(void);
 277 static void __glXExtensionsCtrScreen(struct glx_screen * psc);
 278 static void __glXProcessServerString(const struct extension_info *ext,
 279                                      const char *server_string,
 280                                      unsigned char *server_support);
 281
 282 /**
 283  * Set the state of a GLX extension.
 284  *
 285  * \param name      Name of the extension.
 286  * \param name_len  Length, in characters, of the extension name.
 287  * \param state     New state (either enabled or disabled) of the extension.
 288  * \param supported Table in which the state of the extension is to be set.
 289  */
 290 static void
 291 set_glx_extension(const struct extension_info *ext,
 292                   const char *name, unsigned name_len, GLboolean state,
 293                   unsigned char *supported)
 294 {
 295    unsigned i;
 296
 297
 298    for (i = 0; ext[i].name != NULL; i++) {
 299       if ((name_len == ext[i].name_len)
 300           && (strncmp(ext[i].name, name, name_len) == 0)) {
 301          if (state) {
 302             SET_BIT(supported, ext[i].bit);
 303          }
 304          else {
 305             CLR_BIT(supported, ext[i].bit);
 306          }
 307
 308          return;
 309       }
 310    }
 311 }
 312
 313
 314 #define NUL '\0'
 315 #define SEPARATOR ' '
 316
 317 /**
 318  * Convert the server's extension string to a bit-field.
 319  *
 320  * \param server_string   GLX extension string from the server.
 321  * \param server_support  Bit-field of supported extensions.
 322  *
 323  * \note
 324  * This function is used to process both GLX and GL extension strings.  The
 325  * bit-fields used to track each of these have different sizes.  Therefore,
 326  * the data pointed by \c server_support must be preinitialized to zero.
 327  */
 328 static void
 329 __glXProcessServerString(const struct extension_info *ext,
 330                          const char *server_string,
 331                          unsigned char *server_support)
 332 {
 333    unsigned base;
 334    unsigned len;
 335
 336    for (base = 0; server_string[base] != NUL; /* empty */ ) {
 337       /* Determine the length of the next extension name.
 338        */
 339       for (len = 0; (server_string[base + len] != SEPARATOR)
 340            && (server_string[base + len] != NUL); len++) {
 341          /* empty */
 342       }
 343
 344       /* Set the bit for the extension in the server_support table.
 345        */
 346       set_glx_extension(ext, &server_string[base], len, GL_TRUE,
 347                         server_support);
 348
 349
 350       /* Advance to the next extension string.  This means that we skip
 351        * over the previous string and any trialing white-space.
 352        */
 353       for (base += len; (server_string[base] == SEPARATOR)
 354            && (server_string[base] != NUL); base++) {
 355          /* empty */
 356       }
 357    }
 358 }
 359
 360 void
 361 __glXEnableDirectExtension(struct glx_screen * psc, const char *name)
 362 {
 363    __glXExtensionsCtr();
 364    __glXExtensionsCtrScreen(psc);
 365
 366    set_glx_extension(known_glx_extensions,
 367                      name, strlen(name), GL_TRUE, psc->direct_support);
 368 }
 369
 370 /**
 371  * Initialize global extension support tables.
 372  */
 373
 374 static void
 375 __glXExtensionsCtr(void)
 376 {
 377    unsigned i;
 378    static GLboolean ext_list_first_time = GL_TRUE;
 379
 380
 381    if (ext_list_first_time) {
 382       ext_list_first_time = GL_FALSE;
 383
 384       (void) memset(client_glx_support, 0, sizeof(client_glx_support));
 385       (void) memset(direct_glx_support, 0, sizeof(direct_glx_support));
 386       (void) memset(client_glx_only, 0, sizeof(client_glx_only));
 387       (void) memset(direct_glx_only, 0, sizeof(direct_glx_only));
 388
 389       (void) memset(client_gl_support, 0, sizeof(client_gl_support));
 390       (void) memset(client_gl_only, 0, sizeof(client_gl_only));
 391
 392       for (i = 0; known_glx_extensions[i].name != NULL; i++) {
 393          const unsigned bit = known_glx_extensions[i].bit;
 394
 395          if (known_glx_extensions[i].client_support) {
 396             SET_BIT(client_glx_support, bit);
 397          }
 398
 399          if (known_glx_extensions[i].direct_support) {
 400             SET_BIT(direct_glx_support, bit);
 401          }
 402
 403          if (known_glx_extensions[i].client_only) {
 404             SET_BIT(client_glx_only, bit);
 405          }
 406
 407          if (known_glx_extensions[i].direct_only) {
 408             SET_BIT(direct_glx_only, bit);
 409          }
 410       }
 411
 412       for (i = 0; known_gl_extensions[i].name != NULL; i++) {
 413          const unsigned bit = known_gl_extensions[i].bit;
 414
 415          if (known_gl_extensions[i].client_support) {
 416             SET_BIT(client_gl_support, bit);
 417          }
 418
 419          if (known_gl_extensions[i].client_only) {
 420             SET_BIT(client_gl_only, bit);
 421          }
 422       }
 423
 424 #if 0
 425       fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n",
 426               __func__, __LINE__, gl_major, gl_minor);
 427 #endif
 428    }
 429 }
 430
 431
 432 /**
 433  * Make sure that per-screen direct-support table is initialized.
 434  *
 435  * \param psc  Pointer to GLX per-screen record.
 436  */
 437
 438 static void
 439 __glXExtensionsCtrScreen(struct glx_screen * psc)
 440 {
 441    if (psc->ext_list_first_time) {
 442       psc->ext_list_first_time = GL_FALSE;
 443       (void) memcpy(psc->direct_support, direct_glx_support,
 444                     sizeof(direct_glx_support));
 445    }
 446 }
 447
 448
 449 /**
 450  * Check if a certain extension is enabled on a given screen.
 451  *
 452  * \param psc  Pointer to GLX per-screen record.
 453  * \param bit  Bit index in the direct-support table.
 454  * \returns If the extension bit is enabled for the screen, \c GL_TRUE is
 455  *          returned.  If the extension bit is not enabled or if \c psc is
 456  *          \c NULL, then \c GL_FALSE is returned.
 457  */
 458 GLboolean
 459 __glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit)
 460 {
 461    GLboolean enabled = GL_FALSE;
 462
 463    if (psc != NULL) {
 464       __glXExtensionsCtr();
 465       __glXExtensionsCtrScreen(psc);
 466       enabled = EXT_ENABLED(bit, psc->direct_support);
 467    }
 468
 469    return enabled;
 470 }
 471
 472
 473 /**
 474  * Check if a certain extension is enabled in a given context.
 475  *
 476  */
 477 GLboolean
 478 __glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit)
 479 {
 480    GLboolean enabled = GL_FALSE;
 481
 482    if (gc != NULL) {
 483       enabled = EXT_ENABLED(bit, gc->gl_extension_bits);
 484    }
 485
 486    return enabled;
 487 }
 488
 489
 490
 491 /**
 492  * Convert a bit-field to a string of supported extensions.
 493  */
 494 static char *
 495 __glXGetStringFromTable(const struct extension_info *ext,
 496                         const unsigned char *supported)
 497 {
 498    unsigned i;
 499    unsigned ext_str_len;
 500    char *ext_str;
 501    char *point;
 502
 503
 504    ext_str_len = 0;
 505    for (i = 0; ext[i].name != NULL; i++) {
 506       if (EXT_ENABLED(ext[i].bit, supported)) {
 507          ext_str_len += ext[i].name_len + 1;
 508       }
 509    }
 510
 511    ext_str = Xmalloc(ext_str_len + 1);
 512    if (ext_str != NULL) {
 513       point = ext_str;
 514
 515       for (i = 0; ext[i].name != NULL; i++) {
 516          if (EXT_ENABLED(ext[i].bit, supported)) {
 517             (void) memcpy(point, ext[i].name, ext[i].name_len);
 518             point += ext[i].name_len;
 519
 520             *point = ' ';
 521             point++;
 522          }
 523       }
 524
 525       *point = '\0';
 526    }
 527
 528    return ext_str;
 529 }
 530
 531
 532 /**
 533  * Get the string of client library supported extensions.
 534  */
 535 const char *
 536 __glXGetClientExtensions(void)
 537 {
 538    if (__glXGLXClientExtensions == NULL) {
 539       __glXExtensionsCtr();
 540       __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions,
 541                                                          client_glx_support);
 542    }
 543
 544    return __glXGLXClientExtensions;
 545 }
 546
 547
 548 /**
 549  * Calculate the list of application usable extensions.  The resulting
 550  * string is stored in \c psc->effectiveGLXexts.
 551  *
 552  * \param psc                        Pointer to GLX per-screen record.
 553  * \param display_is_direct_capable  True if the display is capable of
 554  *                                   direct rendering.
 555  * \param minor_version              GLX minor version from the server.
 556  */
 557
 558 void
 559 __glXCalculateUsableExtensions(struct glx_screen * psc,
 560                                GLboolean display_is_direct_capable,
 561                                int minor_version)
 562 {
 563    unsigned char server_support[8];
 564    unsigned char usable[8];
 565    unsigned i;
 566
 567    __glXExtensionsCtr();
 568    __glXExtensionsCtrScreen(psc);
 569
 570    (void) memset(server_support, 0, sizeof(server_support));
 571    __glXProcessServerString(known_glx_extensions,
 572                             psc->serverGLXexts, server_support);
 573
 574
 575    /* This is a hack.  Some servers support GLX 1.3 but don't export
 576     * all of the extensions implied by GLX 1.3.  If the server claims
 577     * support for GLX 1.3, enable support for the extensions that can be
 578     * "emulated" as well.
 579     */
 580 #ifndef GLX_USE_APPLEGL
 581    if (minor_version >= 3) {
 582       SET_BIT(server_support, EXT_visual_info_bit);
 583       SET_BIT(server_support, EXT_visual_rating_bit);
 584       SET_BIT(server_support, SGI_make_current_read_bit);
 585       SET_BIT(server_support, SGIX_fbconfig_bit);
 586       SET_BIT(server_support, SGIX_pbuffer_bit);
 587
 588       /* This one is a little iffy.  GLX 1.3 doesn't incorporate all of this
 589        * extension.  However, the only part that is not strictly client-side
 590        * is shared.  That's the glXQueryContext / glXQueryContextInfoEXT
 591        * function.
 592        */
 593
 594       SET_BIT(server_support, EXT_import_context_bit);
 595    }
 596 #endif
 597
 598    /* An extension is supported if the client-side (i.e., libGL) supports
 599     * it and the "server" supports it.  In this case that means that either
 600     * the true server supports it or it is only for direct-rendering and
 601     * the direct rendering driver supports it.
 602     *
 603     * If the display is not capable of direct rendering, then the extension
 604     * is enabled if and only if the client-side library and the server
 605     * support it.
 606     */
 607
 608    if (display_is_direct_capable) {
 609       for (i = 0; i < 8; i++) {
 610          usable[i] = (client_glx_support[i] & client_glx_only[i])
 611             | (client_glx_support[i] & psc->direct_support[i] &
 612                server_support[i])
 613             | (client_glx_support[i] & psc->direct_support[i] &
 614                direct_glx_only[i]);
 615       }
 616    }
 617    else {
 618       for (i = 0; i < 8; i++) {
 619          usable[i] = (client_glx_support[i] & client_glx_only[i])
 620             | (client_glx_support[i] & server_support[i]);
 621       }
 622    }
 623
 624    /* This hack is necessary because GLX_ARB_create_context_profile depends on
 625     * server support, but GLX_EXT_create_context_es2_profile is direct-only.
 626     * Without this hack, it would be possible to advertise
 627     * GLX_EXT_create_context_es2_profile without
 628     * GLX_ARB_create_context_profile.  That would be a problem.
 629     */
 630    if (!IS_SET(server_support, ARB_create_context_profile_bit)) {
 631       CLR_BIT(usable, EXT_create_context_es2_profile_bit);
 632    }
 633
 634    psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions,
 635                                                    usable);
 636 }
 637
 638
 639 /**
 640  * Calculate the list of application usable extensions.  The resulting
 641  * string is stored in \c gc->extensions.
 642  *
 643  * \param gc             Pointer to GLX context.
 644  * \param server_string  Extension string from the server.
 645  * \param major_version  GL major version from the server.
 646  * \param minor_version  GL minor version from the server.
 647  */
 648
 649 void
 650 __glXCalculateUsableGLExtensions(struct glx_context * gc,
 651                                  const char *server_string,
 652                                  int major_version, int minor_version)
 653 {
 654    unsigned char server_support[__GL_EXT_BYTES];
 655    unsigned char usable[__GL_EXT_BYTES];
 656    unsigned i;
 657
 658
 659    __glXExtensionsCtr();
 660
 661    (void) memset(server_support, 0, sizeof(server_support));
 662    __glXProcessServerString(known_gl_extensions, server_string,
 663                             server_support);
 664
 665
 666    /* Handle lazy servers that don't export all the extensions strings that
 667     * are part of the GL core version that they support.
 668     */
 669
 670    for (i = 0; i < __GL_EXT_BYTES; i++) {
 671       if ((known_gl_extensions[i].version_major != 0)
 672           && ((major_version > known_gl_extensions[i].version_major)
 673               || ((major_version == known_gl_extensions[i].version_major)
 674                   && (minor_version >=
 675                       known_gl_extensions[i].version_minor)))) {
 676          SET_BIT(server_support, known_gl_extensions[i].bit);
 677       }
 678    }
 679
 680
 681    /* An extension is supported if the client-side (i.e., libGL) supports
 682     * it and the server supports it or the client-side library supports it
 683     * and it only needs client-side support.
 684     */
 685
 686    for (i = 0; i < __GL_EXT_BYTES; i++) {
 687       usable[i] = (client_gl_support[i] & client_gl_only[i])
 688          | (client_gl_support[i] & server_support[i]);
 689    }
 690
 691    gc->extensions = (unsigned char *)
 692       __glXGetStringFromTable(known_gl_extensions, usable);
 693    (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable));
 694 }
 695
 696
 697 /**
 698  * Calculates the maximum core GL version that can be supported for indirect
 699  * rendering.
 700  */
 701 void
 702 __glXGetGLVersion(int *major_version, int *minor_version)
 703 {
 704    __glXExtensionsCtr();
 705    *major_version = gl_major;
 706    *minor_version = gl_minor;
 707 }
 708
 709
 710 /**
 711  * Get a string representing the set of extensions supported by the client
 712  * library.  This is currently only used to send the list of extensions
 713  * supported by the client to the server.
 714  */
 715 char *
 716 __glXGetClientGLExtensionString(void)
 717 {
 718    __glXExtensionsCtr();
 719    return __glXGetStringFromTable(known_gl_extensions, client_gl_support);
 720 }